Bob,

E-Bay has some skins w/wings for sale. You could also try English Angling Trappings:

English Angling Trappings
One Apple Blossom Lane
New Fairfield, CT 06812
(203) 746-1348

Actually if you do an internet search, you should get a few more hits for other flyshops. You could probably use partridge or grouse for substitute. Happy tying.

Regards,
ScottP